SCR Nozzle Cooling via Segmented Coolant Pathways
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Solution Overview
Problem
The SCR catalyst system in diesel engines faces heat damage issues during the regeneration process, leading to potential melting or explosion of the SCR injection nozzle module and peripheral components due to rising temperatures, necessitating an effective cooling solution.
Innovation Solution
An electronic control clutch water pump is integrated into the engine room to circulate engine coolant through a coolant circulation pathway within the SCR system, including the SCR injection nozzle module and urea tank, allowing for controlled cooling of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DPF regeneration process is performed to remove particulate matter, then the PM removal efficiency is improved, but the temperature of the SCR injection nozzle module and peripheral parts rises causing heat damage
Solution Approach 1:
The cooling system is segmented into multiple independent coolant circulation pathways: a first coolant circulation pathway for the SCR injection nozzle module and a second coolant circulation pathway for the urea tank. This segmentation allows targeted cooling of specific hot components during DPF regeneration without interfering with the regeneration process itself.
Solution Approach 2:
A coolant acts as an intermediary substance to transfer heat away from the SCR injection nozzle module and urea tank during DPF regeneration. The coolant circulation pathways enable thermal energy to be moved from the hot SCR components to a cooling medium, preventing direct heat damage while allowing the regeneration process to proceed.
2Object-affected harmful factors
If a separate cooling system is installed to cool the SCR system, then the cooling effectiveness is improved, but the system complexity and cost increase
Solution Approach 1:
The engine coolant system is made multi-functional by adding coolant circulation pathways that serve both the original engine cooling function and the new SCR system cooling function. The same coolant pump and coolant reservoir serve dual purposes, eliminating the need for separate cooling systems and reducing overall complexity.
Solution Approach 2:
The SCR cooling system is merged with the existing engine coolant system. The coolant circulation pathways for the SCR injection nozzle module and urea tank are integrated into the engine's coolant loop, allowing a single cooling infrastructure to handle both engine and SCR cooling needs, thereby reducing system complexity and cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively cools the SCR injection nozzle module and its peripheral parts without additional costs, preventing heat damage and reducing internal muffler room temperatures, thereby ensuring safe operation without the need for separate cooling systems.
Implementation Method 1
an electronic control clutch water pump configured to circulate coolant to cool a vehicle engine... the coolant associated with operation of the electronic control water pump or the electronic control clutch water pump circulates
Data Source
AI summary
A system for cooling a vehicle selective catalytic reduction (SCR) may include an electronic control clutch water pump configured to circulate coolant to cool a vehicle engine, a controller configured to perform ON/OFF control of the electronic control clutch water pump when cooling of the SCR system is required in addition to the engine cooling, and a coolant circulation pathway provided in the SCR system so that the coolant associated with operation of the electronic control water pump or the electronic control clutch water pump circulates.